Welcome to HCM
We understand your concerns
I went through your desription. You already took an appointment with a paediatrician. Nothing to worry regarding thyroid
problem. You did not mention about her general attitude an general body condition.
Now a days school children do complaint of pains in so many places around body because some other reasons like peer or teacher pressure etc. A kid with healthy body and healthy life style can become lethargic due to psychological causes and vice versa. You should interview her for such problems in detail.
For now, wait for visit to paediatrician. Then paediatrician should be able to conclude what the correct diagnosis is. Keep her food rich in iron and minerals and proteins
How I could clear your doubt partially. Available for further queries.